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Condensed Statements of Cash Flows (USD $)
 6 Months Ended 65 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Cash flows from operating activities:      
Net loss $ (2,762,000) $ (1,884,000) $ (11,441,000)
Adjustments to reconcile net loss to net cash used in operating activities:      
Common stock issued or issuable for services 109,000 64,000 1,638,000
Share based payments 75,000 95,000 397,000
Depreciation 102,000 30,000 259,000
Deferred rent (2,000) 17,000 33,000
Change in operating assets and liabilities:      
Prepaid expenses (117,000) 285,000 (177,000)
Other assets 0 10,000 (10,000)
Accounts payable (106,000) 128,000 664,000
Accrued compensation 315,000 130,000 598,000
Net cash used in operating activities (2,386,000) (1,125,000) (8,039,000)
Cash flows from investing activities:      
Acquisition of fixed assets (131,000) (130,000) (667,000)
Disbursements for patents and other intangible assets (346,000) (69,000) (964,000)
Net cash used in investing activities (477,000) (199,000) (1,631,000)
Cash flows from financing activities:      
Proceeds from issuance of common stock for cash, net of offering costs 0 11,200,000 14,882,000
Proceeds from issuance of short term promissory note 0 98,000 98,000
Principal payments on promissory notes 0 (146,000) (146,000)
Net cash provided by financing activities 0 11,152,000 14,834,000
Net increase (decrease) in cash and cash equivalents (2,863,000) 9,828,000 5,164,000
Cash and cash equivalents, beginning of period 8,027,000 930,000 0
Cash and cash equivalents, end of period 5,164,000 10,758,000 5,164,000
Supplemental disclosure of cash flow information:      
Cash paid during the period for interest $ 0 $ 1,000 $ 1,000